Resolving dependencies...
Configuring newtype-0.2...
Building newtype-0.2...
Preprocessing library newtype-0.2...
[1 of 1] Compiling Control.Newtype  ( Control/Newtype.hs, dist/build/Control/Newtype.o )
In-place registering newtype-0.2...
Running Haddock for newtype-0.2...
Running hscolour for newtype-0.2...
Preprocessing library newtype-0.2...
Preprocessing library newtype-0.2...
Haddock coverage:
 100% (  9 /  9) in 'Control.Newtype'
Documentation created: dist/doc/html/newtype/index.html
Installing library in
/srv/hackage/var/build/tmp-install/lib/x86_64-linux-ghc-7.6.3/newtype-0.2
Registering newtype-0.2...
Installed newtype-0.2
Downloading constraints-0.3.4...
Configuring constraints-0.3.4...
Building constraints-0.3.4...
Preprocessing library constraints-0.3.4...
[1 of 3] Compiling Data.Constraint  ( Data/Constraint.hs, dist/build/Data/Constraint.o )

Data/Constraint.hs:133:43: parse error on input `::'
Failed to install constraints-0.3.4
cabal: Error: some packages failed to install:
constraints-0.3.4 failed during the building phase. The exception was:
ExitFailure 1